Catheter insertion device

ABSTRACT

Embodiments of a catheter insertion device are discussed comprising: an approximately hollow cylindrical catheter sleeve, at whose distal end a catheter is attached; a needle sleeve with a hollow needle, which is attached thereto and which, when ready for use, extends through the catheter sleeve and the catheter, and; a needle protective element that is arranged inside the catheter sleeve while being able to move on the needle. Said needle protective element has an engaging section that engages with an engaging device, which is formed in the vicinity of the needle tip, when the hollow needle is withdrawn from the catheter sleeve. A check valve is placed inside the catheter sleeve between the catheter and the needle protective element. The hollow needle, when ready for use, extends through said check valve, and the check valve automatically closes once the needle is withdrawn.

FIELD

Device, system, and method for a catheter insertion device are generally discussed herein with specific reference to catheter device having a valve opener and a valve.

BACKGROUND

A device of this kind is known from EP 352 928, wherein in a hollow catheter hub a needle guard element is arranged. On withdrawal of the hollow needle from the catheter over an engaging means near the tip of the hollow needle, the needle guard element engages with the engaging means and covers the tip when the hollow needle is separated from the catheter. In this design, after withdrawal of the hollow needle from the catheter, through this catheter blood can issue with which the operating personnel can come into contact.

The invention is based on the object of designing a catheter insertion device of the type described above such that an outflow of blood from the catheter is prevented after removal of the hollow needle with the needle guard element.

SUMMARY

This object is solved according to the invention by the features in the characterizing part of claim 1. In the ready position, a check valve is arranged in the catheter hub between the catheter and the needle guard element. Through this valve the hollow needle extends, so that after withdrawal of the hollow needle from the catheter the latter can be reliably closed such that an outflow of blood is prevented, while simultaneously the tip of the hollow needle is securely covered by the needle guard element so that the operating personnel cannot injure themselves on the needle tip.

BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments of the invention are explained in more detail below with reference to the drawing, in which:

FIG. 1 shows a longitudinal section through a catheter insertion device in the ready position,

FIG. 2 shows the catheter insertion device with the hollow needle removed,

FIG. 3 shows the device with an attached syringe,

FIG. 4 shows a sectional view along the line A-A in FIG. 1,

FIG. 5 shows a longitudinal section through another embodiment,

FIG. 6 shows a view of the valve disc,

FIGS. 7A, 7B, 7C, 7D, and 7E show different views of a valve actuating element,

FIG. 8 shows a longitudinal section through a further embodiment,

FIGS. 9A and 9B show front views of the valve actuating element of FIG. 8, and

FIG. 10 shows a longitudinal section through a further embodiment.

DETAILED DESCRIPTION

FIG. 1 shows a catheter insertion device 1 having a catheter hub 2 which has a two-part form in the embodiment. A distal hub element 3 of the catheter hub has a holding section 3 a in which a catheter 4 is press-fitted. The proximal end of the hub element 3 has an enlarged diameter with regard to the distal end and forms a connecting section with a hub element 5 whose distal end overlaps the proximal end of the hub element 3 and which is provided at its proximal end with a Luer thread 6. Between the two hub elements 3 and 5, a check valve in the form of a valve disc 7 is inserted and is fixed in place by the two hub elements 3 and 5.

In the ready position according to FIG. 1, there is inserted in the catheter hub 2 a needle hub 8 to which a hollow needle 9 is fixed which extends through the valve disc 7 and the catheter 4 so that the needle tip 9 a is exposed. Between needle hub 8 and valve disc 7 there is displaceably arranged in the proximal hub element 5 a valve actuating element 10 which has a truncated cone-shaped locating section 10 a which serves to open the valve disc 7, as FIG. 3 shows. On the proximal side, a plunger section 10 b adjoins the locating section 10 a and has a hollow space for receiving a needle guard element 13. In the embodiment shown, the plunger section 10 b is formed by two spaced plungers between which the needle guard element in the form of a spring clip 13 is inserted, as shown in the cross-sectional view in FIG. 4.

On withdrawal of the hollow needle 9 from the catheter hub 2, an engaging means 9 b (FIG. 2), provided near the needle tip 9 a and having the form of a radial projection on the hollow needle which can be formed by light crimping, engages with the outer circumference of a bore in the rear wall 13 c of the spring clip 13, so that the spring clip 13 is removed from the catheter hub with the needle 9, while simultaneously the spring arms 13 a and 13 b of the spring clip cover the needle tip, completely protecting and blocking it. In this separated position shown in FIG. 2, the valve disc 7, due to its elasticity, closes the through-hole for the hollow needle 9 so that no blood can flow out through the catheter 4. As FIG. 6 shows, the valve disc is provided for example with three slits 7 a starting from the middle and extending radially over a short section X, forming elastic flaps 7 b therebetween which can be expanded by the hollow needle.

FIG. 3 shows the insertion of a syringe 14 in the catheter hub 2, wherein the neck portion 14 a of the syringe comes to abut on the plunger section 10 b of the valve actuating element 10 and presses it against the valve disc 7, so that the truncated cone-shaped locating section 10 a outwardly displaces the flaps 7 b of the valve disc and thereby opens the valve, so that a liquid can be inserted from the syringe 14 into the catheter 4.

The incline of the truncated cone on the locating section 10 a and the displacement path of the actuating element 10 relative to the valve disc 7 are designed such that due to the elasticity of the material of the valve disc 7, the flaps 7 b displace the locating section 10 a to the right in FIG. 3 when the syringe 14 is removed from the catheter hub 2. Hereby, the valve disc 7 is automatically closed, as the position in FIG. 2 shows.

In the hub element 5, there is formed by a shoulder 5 a a stop for the actuating element 10, to define the position of the actuating element in the separated position in FIG. 2. Hereby, the truncated cone-shaped locating section 10 a lies near the stop 5 a, while its distal end abuts on the valve disc 7 as shown in FIG. 2. The radial slits 7 a of the valve disc 7 are designed such that in the ready position in FIG. 1, the flaps 7 b are bent radially upwards less than in the open position by the locating section 10 a in FIG. 3.

As the cross-sectional view in FIG. 4 shows, the two plungers lob of the valve actuating element 10 are guided in longitudinal grooves 5 e of the hub element 5 and they project radially inwards into the bore 5 c of the hub element 5, so that they form an abutting surface for the neck portion 14 a of the syringe 14. The bore 5 c in the hub element 5 is formed slightly conically corresponding to the conical neck portion 14 a of a syringe.

On the inner circumference of the bore 5 c of the hub element 5, a further shoulder 5 b having a smaller diameter is formed, on which the radially outer areas of the spring arms 13 a and 13 b abut in the ready position in FIG. 1. Hereby, the spring clip 13 is fixed in its position in the hub element 5. When the needle hub 8 with the hollow needle 9 is removed from the catheter hub 2, first the spring clip 13 is held on the shoulder 5 b by abutting until the radial projection 9 b comes to abut on the rear wall 13 c of the spring clip. In this position, the two spring arms 13 a, 13 b can be released from the shoulder 5 b and spring back inwards to cover the needle tip, as FIG. 2 shows, whereupon the spring clip 13 with the hollow needle 9 can be removed from the catheter hub.

In the embodiment according to FIGS. 1 to 3, the distal end section of the hub element 5 is shrunk, welded or bonded onto the proximal end section of the hub element 3 after the valve actuating element 10 and the valve disc 7 are inserted in the hub element 5. It is also possible to join the two hub elements 3 and 5 to one another, for example by a thread which is secured against loosening after assembly. The spring clip 13 is inserted together with the hollow needle 9 in the bore 5 c of the hub element 5 during assembly, wherein the radially outer areas of the spring arms 13 a, 13 b snap in at the shoulder 5 b under elastic deformation.

Preferably, in front of the shoulder 5 b a projection 5 b′ can be formed in the bore 5 c of the hub element, as shown in FIG. 2. Hereby the snap-in and holding effect of the spring clip 13 is increased.

FIG. 5 shows a modified embodiment of the connection of the two hub elements 3 and 5, in which two cylindrical sections 3 b and 5 d engage in one another. A thread can be provided between these two cylindrical sections. However, it is also possible to bond or weld these two sections.

In this embodiment, the valve actuating element 10 is also modified in relation to the embodiment of FIGS. 1 to 3. FIG. 7A shows a side view of the approximately U-shaped actuating element 10 with the spring clip 13 inserted therein. As the side view rotated by 90.degree. in FIG. 7B shows, the locating section 10 a is partly flattened on opposite sides so that the width of the plunger sections 10 b extends into the locating section 10 a. FIG. 7C is a front view from the left in FIG. 7B and shows the flattened structure of the locating section 10 a. FIG. 7D is a sectional view along the central line in FIG. 7B. FIG. 7E shows a section through the valve actuating element 10 along the line B-B in FIG. 7D.

FIG. 5 shows the lower half of the valve actuating element 10 corresponding to the view in FIG. 7A, and the upper half in a sectional view rotated by 90.degree. corresponding to FIG. 7B. The shoulder 5 a for positioning the valve actuating element 10 in the hub element 5 is hereby formed on the ends of the diametrically opposite grooves 5 e (FIG. 4), so that the proximal ends of the plunger sections 10 b abut on the shoulders 5 a. Corresponding to the shoulder 5 b in FIGS. 1 to 3 in the embodiment in FIG. 5, there is formed on the hub element 5 a projection 5 f which projects inwards at diametrically opposite positions on the bore 5 c of the hub element 5 and fixes the spring clip 13 in the hub element 5 until the spring arms 13 a, 13 b spring inwards over the needle tip and the spring clip with the hollow needle 9 is removed from the catheter hub.

FIG. 8 shows a modified embodiment having a hollow cylindrical valve actuating element 10 on whose inner circumference a projection 10 f is formed for positioning the spring clip 13 inside the valve actuating element 10. FIG. 9A shows a front view of the valve actuating element 10 from the right and FIG. 9B shows a front view from the left in FIG. 8, wherein for locating the neck portion 14 a of a syringe 14, in this embodiment radially inwardly projecting ribs 10 e are formed which protrude radially into the bore 5 c of the hub element 5, as the upper half of the valve actuating element in FIG. 8 shows, in which the sectional view of the lower half of the valve actuating element 10 is shown rotated by 90.degree. in relation to the upper half.

FIG. 10 shows a modified embodiment wherein between the two hub elements 3 and 5 a check valve 17 is inserted, which has a hollow cylindrical section 17 b starting from a flange section 17 a and abutting on the inner circumference of the hub element 3. From the inner circumference near the flange section 17 a there start two opposite flaps 17 c, which abut on the outer circumference of the hollow needle 9 in the ready position in FIG. 10. When the needle 9 is removed from the catheter hub 2, the elastically deformed flaps 17 c move inwards and close the valve. In this embodiment, an actuating element for opening the valve 17 is not necessary, because the pressure of the fluid from the syringe 14 displaces the flaps 17 c radially outwards so that the liquid can flow out through the valve 17. In this embodiment of a check valve, a so-called duck-bill valve is concerned, whose construction is in itself known.

In FIG. 10, in order to allow the spring clip 13 to be held in the catheter hub during withdrawal of the hollow needle 9 from the catheter hub 2 until the radial projection 9 b on the hollow needle engages with the rear wall 13 c to cover the needle tip, in this embodiment there is formed on the inner circumference of the proximal hub element 5 a projection 5 f which extends radially inwards and on which the radially outer areas of the spring arms 13 a and 13 b come to abut and hold the spring clip until the spring arms spring back radially inwards to cover the needle tip. The inner diameter of the projection 5 f is designed only slightly smaller than the maximum radial dimension at the spring arms 13 a and 13 b, so that during assembly the spring clip 13 can be inserted by slight pressure into the position in the catheter hub as shown in FIG. 10.

In the embodiment of a catheter insertion device according to FIGS. 1 to 9, in the position of the valve actuating element 10 in FIG. 2 the valve disc 7 can be opened by low pressure produced by the syringe 4 for drawing off liquid from the catheter, wherein the elastic flaps 7 b are bent upward by the low pressure. In the embodiment of FIG. 10, a drawing-off of liquid from the catheter is not possible, because the duck-bill valve does not open when there is low pressure on the proximal side.

It is convenient to fabricate the check valve in the form of a valve disc 7 or of the flap valve 17 from elastic silicon, while a correspondingly rigid plastic material is used for the hub elements 3 and 5 and for the valve actuating element 10. 

What is claimed is:
 1. A catheter insertion device comprising: a catheter hub comprising an interior cavity having a perimeter defining an opening at a proximal end, and a catheter tube having a distal end opening extending distally of the first hub; a needle having a needle shaft defining a needle axis projecting distally of an end of a needle hub, said needle projecting through the catheter tube and comprising a needle tip; a valve positioned inside the interior cavity of the catheter hub, said valve being sized and shaped to obstruct fluid flow and comprises a slit; said valve remaining inside the interior cavity of the catheter hub when the needle is removed from the catheter tube and the catheter hub; a valve actuating element slidingly disposed in the interior cavity of the catheter hub to actuate the valve, the valve actuating element comprising a nose section having a base, a tapered end with an opening structured to push the valve to open the slit, and at least one plunger element extending proximally of the base of the nose section and having a cross-sectional dimension smaller than the base of the nose section and a proximal end surface; wherein the at least one plunger element is slidable distally within the catheter hub when a male implement projects into the opening of the catheter hub to push against the proximal end surface to then transfer a distally directed force to the nose section to push the valve to open the slit; a needle protective device positioned proximal of the valve and at least in part around the needle and distal of the proximal end of the needle hub in a ready position, the needle protective device is movable to prevent unintended needle sticks in a protective position.
 2. The catheter insertion device of claim 1, wherein the valve comprises three slits that converge at a single point.
 3. The catheter insertion device of claim 1, wherein the catheter hub is made from two hub housing sections attached to one another.
 4. The catheter insertion device of claim 1, wherein the valve has a radial outer perimeter abutting the interior cavity of the catheter hub.
 5. The catheter insertion device of claim 1, further comprising a second plunger element spaced from the at least one plunger element.
 6. The catheter insertion device of claim 1, wherein the valve actuating element further comprises a projection located proximally of the tapered nose section and projects radially outwardly of the nose section and abutting a shoulder of the catheter hub.
 7. The catheter insertion device of claim 5, wherein the needle projects between the second plunger element and the at least one plunger element in the ready position.
 8. The catheter insertion device of claim 1, wherein the needle protective device comprises an arm that is located, at least in part, in the catheter hub.
 9. The catheter insertion of claim 1, further comprising a crimp on the needle near the needle tip.
 10. A catheter insertion device comprising: a catheter hub comprising an interior cavity, an opening at a proximal end, and a catheter tube attached to a distal end; a needle having a needle shaft defining a needle axis projecting distally of an end of a needle hub, said needle projecting through the catheter tube in a ready position and comprises a needle tip; a valve positioned inside the interior cavity of the catheter hub and in contact with the interior cavity, said valve being sized and shaped to obstruct fluid flow and comprises a wall surface comprising a slit; said valve remaining inside the interior cavity when the needle is removed from the catheter tube and the catheter hub; a valve actuating element slidingly disposed in the catheter hub to actuate the valve, the valve actuating element comprising a nose section having a tapered end for pushing the valve to open the slit and a plunger end extending proximally of the nose section; the plunger end being non-continuous along a circumference and sufficiently rigid to transfer a distally directed force to the nose section to push the valve to open the slit; a needle protective device spaced from the needle tip in the ready position and movable relative to the needle tip to a protective position, at least in part distally of the needle tip to prevent unintended needle sticks.
 11. The catheter insertion of claim 10, wherein the non-continuous plunger end comprises at least two spaced apart plunger elements.
 12. The catheter insertion device of claim 10, wherein the needle comprises a crimp on the needle near the needle tip.
 13. The catheter insertion device of claim 10, wherein the valve comprises three slits that converge at a single point.
 14. The catheter insertion device of claim 10, wherein the needle protective device comprises a proximal wall and two arms that converge at a single point when viewed along a side of the needle.
 15. The catheter insertion device of claim 10, wherein the catheter hub is made from two hub housing sections that are attached to one another.
 16. The catheter insertion device of claim 10, wherein the valve actuating element further comprises a projection located proximally of the tapered nose section and projects radially outwardly of the nose section and abutting a shoulder of the catheter hub.
 17. The catheter insertion device of claim 16, wherein the projection is distal of the at least two plunger elements.
 18. The catheter insertion device of claim 10, wherein the needle protective device comprises an arm that is located, at least in part, in the catheter hub. 